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Inventories - Schedule of Major Classifications of Inventories (Detail) - USD ($)
$ in Thousands
Jan. 31, 2020
Jul. 31, 2019
Inventory [Line Items]    
Work in process $ 127,910 $ 126,636
Raw materials 290,170 300,721
Chassis 221,339 155,099
Subtotal 972,958 873,532
Excess of FIFO costs over LIFO costs (46,044) (45,544)
Total inventories, net 926,914 827,988
Recreational vehicles    
Inventory [Line Items]    
Finished products 268,191 230,483
Other    
Inventory [Line Items]    
Finished products $ 65,348 $ 60,593